An international team of scientists will embark this week on a six‑week field expedition to Greenland to study how rapidly melting fjord glaciers are altering the North Atlantic and whether those changes could push ocean circulation toward a critical tipping point.
The mission, which begins 16 July 2026, will operate from the UK polar research ship RRS Sir David Attenborough. Researchers will deploy a suite of instruments — including airborne drones, marine robots, satellite observations and in‑water sensors — to collect detailed measurements of glacier discharge and the surrounding ocean.
Project GIANT and its goals
The work is part of a five‑year international collaboration called GIANT (Greenland Ice sheet to AtlaNtic Tipping points), led by the British Antarctic Survey and funded by the Advanced Research + Invention Agency (ARIA) under its Forecasting Tipping Points programme. The consortium comprises 17 partners, including seven international institutions, and aims to improve predictions of how Greenland’s ice loss will interact with Atlantic circulation systems.
Scientists are particularly focused on the North Atlantic Subpolar Gyre, a large, rotating system of currents that helps sustain the Atlantic Meridional Overturning Circulation (AMOC). The AMOC transports warm, salty water northward from the tropics; that water cools, becomes denser and sinks in the high latitudes, pulling water northward and sustaining a global three‑dimensional conveyor of heat and nutrients.
Researchers warned that the influx of cold, fresh meltwater from Greenland’s fjord glaciers could form a buoyant surface layer that inhibits the sinking of dense water beneath the Subpolar Gyre. If that sinking were substantially reduced, the AMOC could slow, with potential consequences for regional climate, including changes in temperature and storm patterns across the UK and Europe. Some estimates referenced by the project say such changes could occur within decades.
Methods and measurements
The expedition will combine in situ and remote techniques to build a high‑resolution picture of glacier–ocean interactions:
- Autonomous marine robots to profile water properties beneath and around glacier fronts
- Airborne drones for aerial mapping of glacier termini and sea surface conditions
- Satellite data to place local observations in a broader oceanographic context
- Fixed and drifting sensors to track the distribution of freshwater plumes
Data gathered during the cruise will be used to refine models that link local glacier melt to changes in ocean stratification and circulation strength. Improved observations are intended to reduce uncertainties about how quickly the Subpolar Gyre and AMOC might respond to accelerating Greenland melt.
| Item | Detail |
|---|---|
| Expedition length | Six weeks (starting 16 July 2026) |
| Research vessel | RRS Sir David Attenborough |
| Project | GIANT (five years, 17 partners) |
| Funding | Advanced Research + Invention Agency (ARIA) |
Understanding the processes at glacier fronts is essential because small‑scale mixing and buoyant freshwater pathways can have outsized effects on regional water density and circulation. By combining diverse observational platforms, the GIANT team hopes to capture those processes at the scales needed to inform ocean‑circulation models and climate forecasts.
As the planet warms and Greenland’s ice loss accelerates, researchers say targeted field campaigns like this one are needed to move from plausible scenarios to quantitative forecasts. The outcomes will be important not only for scientific understanding but for national and regional adaptation planning in areas that could be affected by shifts in ocean circulation and associated climate changes.
